Fungus, Insects and Parasites That Affect Trees

diseased leaf gymnosporangium sabinae

Acute Oak Decline

A relatively new disease, mainly affecting native Oak trees in Britain. First recorded 30-35 years ago. The areas most affect are in South East England and the Midlands.
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Ash Dieback

Chalara dieback of Ash is a disease of ash trees caused by Hymenoscyphus frexineus fungus.
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Asian Longhorn Beetle

All infested trees within 100m zone must be felled and incinerated to prevent the spread of the beetle.
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Emerald Ash Borer (Buprestidae)

It causes significant damage to the Ash tree. Small trees can be killed within a year, older trees within 4 years.
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Horse Chestnut Canker (Bleeding)

Most often the cause is due to the bacterial pathogen ‘Pseudomonas Syringae PV Aesculi’ and only occasionally by Phytophthora.
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Horse Chestnut Leaf Miner (Cameraria Ohridella)

Its larvae mine within the leaves and if large in population can destroy most of the leaf tissue.
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Massaria Disease of Plane Trees

It doesn’t severely affect tree health, but it can cause the branches to fall off which is particularly dangerous in urban areas.
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Oak Processionary Moths (Thaumetopoea Processionea)

The caterpillars have tiny hairs which can cause skin and eye irritations and sore throats and breathing difficulties in people and animals.
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Phytophthora Austrocedri

A fungus-like pathogen, which is a serious threat to juniper trees.

Phytophythora Ramorum

A fungus-like pathogen, which causes extensive damage to a wide range of trees and plants. In the USA it is known as 'Sudden Oak Death' and in the UK 'Larch Tree Disease' and 'Japanese Larch Disease.'

Red Band Needle Blight (Dothistroma Needle Blight)

It is a disease of Conifers. Causing premature needle defoliation, resulting in loss of yield and in severe cases tree death.

Sweet Chestnut Blight

A fungus that killed an estimated 3.5 billion trees in USA during the first half of the twentieth century.


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